CVE-2026-76442

Sentinel/Defender KQL

// This query attempts to detect unusual resource consumption indicative of CWE-1284 (Improper validation of specified quantity in input)
// Adjust thresholds and specific process names based on your environment and typical usage patterns.
DeviceProcessEvents
| where InitiatingProcessFileName =~ "esa_manager.exe" or InitiatingProcessFileName =~ "email_gateway.exe" // Example process names for Cisco Secure Email Gateway/Manager
| summarize (TotalCPU, TotalMemory) = (sum(ProcessPerformance.CPU), sum(ProcessPerformance.WorkingSetBytes)) by DeviceName, InitiatingProcessFileName, bin(Timestamp, 5m)
| where TotalCPU > 90 or TotalMemory > 8000000000 // Example: >90% CPU or >8GB memory usage over 5 minutes
| project Timestamp, DeviceName, InitiatingProcessFileName, TotalCPU, TotalMemory
| extend AlertReason = "Potential excessive resource consumption (CWE-1284)"

Splunk SPL

# This query attempts to detect unusual resource consumption indicative of CWE-1284 (Improper validation of specified quantity in input)
# Adjust thresholds and specific process names based on your environment and typical usage patterns.
index=your_index_for_cisco_logs (process_name="esa_manager.exe" OR process_name="email_gateway.exe")
| bucket span=5m _time
| stats sum(cpu_usage) as TotalCPU, sum(memory_usage_bytes) as TotalMemory by host, process_name, _time
| where TotalCPU > 90 OR TotalMemory > 8000000000
| table _time, host, process_name, TotalCPU, TotalMemory
| eval AlertReason = "Potential excessive resource consumption (CWE-1284)"

Sigma

title: Cisco Secure Email Gateway - Excessive Resource Consumption
id: 00000000-0000-0000-0000-000000000000 # Placeholder - generate a unique GUID
status: experimental
description: Detects potential excessive resource consumption in Cisco Secure Email Gateway or Web Manager, indicative of CWE-1284.
author: SecBoard
date: 2026/09/14
logsource:
  category: process_creation
  product: windows # Assuming Windows hosts for the manager, adjust as needed
detection:
  selection:
    Image|endswith:
      - '\esa_manager.exe'
      - '\email_gateway.exe'
  condition: selection
  timeframe: 5m
  # Note: Sigma itself cannot directly evaluate resource consumption metrics like CPU/Memory usage.
  # This rule focuses on process creation/activity. For resource usage, integrate with platform-specific queries.
  # This rule would need to be augmented with a correlation rule in the SIEM to check for high resource usage.
level: high

Elastic ES|QL

// This query attempts to detect unusual resource consumption indicative of CWE-1284 (Improper validation of specified quantity in input)
// Adjust thresholds and specific process names based on your environment and typical usage patterns.
from logs-cisco.secure_email_gateway-*
| where process.name == "esa_manager.exe" or process.name == "email_gateway.exe"
| summarize TotalCPU = sum(process.cpu.usage), TotalMemory = sum(process.memory.usage) by host.name, process.name, span(timestamp, 5m)
| where TotalCPU > 90 or TotalMemory > 8000000000 // Example: >90% CPU or >8GB memory usage over 5 minutes
| project timestamp, host.name, process.name, TotalCPU, TotalMemory
| extend AlertReason = "Potential excessive resource consumption (CWE-1284)"